fan is not coming on fan is good fues are good i do not see a relay labled rad fan i have a tcm and asd relay along with the outher relays what am i missing fan is not coming on fan is good fues are good i do not see a relay labled rad fan i have a tcm and asd relay along with the outher relays what am i missing

jeep overheated all of a sudden. found that the fan was not working. told it might be the fan relay module. let me know if something works. jeep overheated all of a sudden. found that the fan was not working. told it might be the fan relay module. let me know if something works.

Locate the relay in the under hood relay center remove it and swap it with the A/C relay or a relay that looks the same. If the fan still doesn't come on, the fan is not working anymore. If it does come on, go to the parts store and replace the relay. You can use a jump wire to the hot side of the fan from the pos side of the battery to see if the fan comes on. Also run a jump ground. Disconnect the harness to the fan so you don't back feed the ECM. Just use a couple of flat female blade connectors and wires to jump to the battery to test fan. $600.00 is way too much to replace the fan. You can find a good replacement fan assy. at the local wrecking yard for cheap. They work out just fine.

The fan relay is located behind the bumper fascia below the headlight. I should have posted that in my last post.The fan relay is located behind the bumper fascia below the headlight. I should have posted that in my last post.

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Physically look in the radiator under the cap when cool, for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.Radiator fins dirty, clean with a strong stream of water, not high pressure water.Radiator clogged, try backflushing it, or replace.Thermostat stuck open or shut, replace it.Water pump worn out, can no longer move enough coolant, replace it.Fan shroud broken or missing....Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it's loose, airflow can actually push it out of place making it useless or blocking the airflow. Along with that, there may also be a plastic piece attached to the bottom of, and wraps up behind the bumper. If it's loose, airflow can actually push it out of place blocking the airflow. Simply reattach it with 4 or 5 screws.

Also, if the vehicle has A/C and electric fans, one fan is dedicated to the A/C and should come on almost the instant the A/C is turned on. The engine fan will run even with the key off, that is normal. The system is trying to cool itself. Hope this helps.

Physically look in the radiator under the cap when cool, for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.Radiator fins dirty, clean with a strong stream of water, not high pressure water.Radiator clogged, try backflushing it, or replace.Thermostat stuck open or shut, replace it.Water pump worn out, can no longer move enough coolant, replace it.Fan shroud broken or missing....Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.

Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it's loose, airflow can actually push it out of place making it useless or blocking the airflow. Along with that, there may also be a plastic piece attached to the bottom of, and wraps up behind the bumper. If it's loose, airflow can actually push it out of place blocking the airflow. Simply reattach it with 4 or 5 screws.

Also, if the vehicle has A/C and electric fans, one fan is dedicated to the A/C and should come on almost the instant the A/C is turned on. The engine fan will run even with the key off, that is normal. The system is trying to cool itself. Hope this helps.You can simply replace or unplug the sensor. Unplugging it should turn off the warning light and won

Fan relay is located under pass headlight. Remove light assembly, use 2 1/2 " hole saw to drill hole in plastic housing ,3"from back wall, 3'' from left side.This will put you right over relay. Unscrew two bolts,replace. Relay was $40.... dealer wanted$350 to remove front bumper to replace it.

There should be a relay controlling them, check the relay comm for power.. You can connect the radiator fan driectly to the battery to prevent over heating. It has two wires, splice them and connect them to the battery via 2 other pieces of wire. In my opinion its very difficult to actually help with this one remotely since we would need to be on spot to test the circuit. I strongly suggest haveing an autoelectrican check this for you. YOu can connect the radiator fan directly to the battery to help you get there..

BTW the radiator contains a thermostat. this turns the fan on and off, of this is faulty you will have the problem you described. check the thermostat in the radiator.

The fan relay may be malfunctioning (the fan relay is what actually switches the fan on and off and gets its signal from the ECM, which in turn gets its signal from the temp sensor) testing/replacing the relay and temp sensor would be the best thing to start with,... unless you notice any additional (non factory) wire attached to the power wires to the fan. Sometimes folks, in an attmpt to fix an overheating or fan relay problem, attach a ignition switched positive lead from the fusebox or other switched source to the positive poer lead on the fan,.. making the fan run whenever the ignition is switched on.